High-carbon, chromium steel tapered roller bearings offer dimensional stability under heavy loads, long life in harsh environments, durable steel cage, and interchangeability with other bearings. They are available in 15 to 240 mm or 0.59 to 9.45 in. ID to 35 to 40 mm or 1.38 to 15.75 OD and are composed of cone (inner ring), cup (outer ring), tapered rollers, and cage (roller retainer). They are through-hardened and case-hardened for consistent surface hardness.
AST Bearings, (800) 526-1250, www.astbearings.com